 /*******************************************************************************
  * Copyright (c) 2000, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/

 package org.eclipse.ui.internal.activities;

 import java.util.Collection ;
 import java.util.HashMap ;
 import java.util.HashSet ;
 import java.util.Iterator ;
 import java.util.Map ;

 import org.eclipse.ui.internal.util.Util;

 public final class ActivityRequirementBindingDefinition {
     private final static int HASH_FACTOR = 89;

     private final static int HASH_INITIAL = ActivityRequirementBindingDefinition.class
             .getName().hashCode();

     static Map activityRequirementBindingDefinitionsByActivityId(
             Collection activityRequirementBindingDefinitions) {
         if (activityRequirementBindingDefinitions == null) {
             throw new NullPointerException ();
         }

         Map map = new HashMap ();
         Iterator iterator = activityRequirementBindingDefinitions.iterator();

         while (iterator.hasNext()) {
             Object object = iterator.next();
             Util.assertInstance(object,
                     ActivityRequirementBindingDefinition.class);
             ActivityRequirementBindingDefinition activityRequirementBindingDefinition = (ActivityRequirementBindingDefinition) object;
             String parentActivityId = activityRequirementBindingDefinition
                     .getActivityId();

             if (parentActivityId != null) {
                 Collection activityRequirementBindingDefinitions2 = (Collection ) map
                         .get(parentActivityId);

                 if (activityRequirementBindingDefinitions2 == null) {
                     activityRequirementBindingDefinitions2 = new HashSet ();
                     map.put(parentActivityId,
                             activityRequirementBindingDefinitions2);
                 }

                 activityRequirementBindingDefinitions2
                         .add(activityRequirementBindingDefinition);
             }
         }

         return map;
     }

     private String requiredActivityId;

     private transient int hashCode = HASH_INITIAL;

     private String activityId;

     private String sourceId;

     private transient String string;

     public ActivityRequirementBindingDefinition(String requiredActivityId,
             String activityId, String sourceId) {
         this.requiredActivityId = requiredActivityId;
         this.activityId = activityId;
         this.sourceId = sourceId;
     }

     public int compareTo(Object object) {
         ActivityRequirementBindingDefinition castedObject = (ActivityRequirementBindingDefinition) object;
         int compareTo = Util.compare(requiredActivityId,
                 castedObject.requiredActivityId);

         if (compareTo == 0) {
             compareTo = Util.compare(activityId, castedObject.activityId);

             if (compareTo == 0) {
                 compareTo = Util.compare(sourceId, castedObject.sourceId);
             }
         }

         return compareTo;
     }

     public boolean equals(Object object) {
         if (!(object instanceof ActivityRequirementBindingDefinition)) {
             return false;
         }

         final ActivityRequirementBindingDefinition castedObject = (ActivityRequirementBindingDefinition) object;
         if (!Util.equals(requiredActivityId,
                 castedObject.requiredActivityId)) {
             return false;
         }
         
         if (!Util.equals(activityId, castedObject.activityId)) {
             return false;
         }
         
         return Util.equals(sourceId, castedObject.sourceId);
     }

     public String getRequiredActivityId() {
         return requiredActivityId;
     }

     public String getActivityId() {
         return activityId;
     }

     public String getSourceId() {
         return sourceId;
     }

     public int hashCode() {
         if (hashCode == HASH_INITIAL) {
             hashCode = hashCode * HASH_FACTOR
                     + Util.hashCode(requiredActivityId);
             hashCode = hashCode * HASH_FACTOR + Util.hashCode(activityId);
             hashCode = hashCode * HASH_FACTOR + Util.hashCode(sourceId);
             if (hashCode == HASH_INITIAL) {
                 hashCode++;
             }
         }

         return hashCode;
     }

     public String toString() {
         if (string == null) {
             final StringBuffer stringBuffer = new StringBuffer ();
             stringBuffer.append('[');
             stringBuffer.append(requiredActivityId);
             stringBuffer.append(',');
             stringBuffer.append(activityId);
             stringBuffer.append(',');
             stringBuffer.append(sourceId);
             stringBuffer.append(']');
             string = stringBuffer.toString();
         }

         return string;
     }
 }

